While there will be some advantages to a 2C warmer global climate we are already observing many negative impacts with <1C of a warmer global climate. Sea level rise will persist, even at 1C of warming. Harmful migrations of species to areas that were formerly too cold to support their existence there a few decades ago are already causing problems. The Pine Bark beetle migration is an example of such.

We don't know that. The evidence in history suggests that it is better. We are already seeing the greening of deserts because of higher CO2 levels(note this is not higher temperature). The warmer climate will lead to warmer nights and winters so less crop will die.

It will likely be marginally worse for somethings and marginally better for other. For most, it should be better. If we didn't have cult like following believing any warming must be bad, obviously most would recognize the obvious benefits from warming.

Greenhouse gases should warm winter, night, and polar temperatures most. One obvious example of this is that humid cloudy nights tend to be warmer. This morning it was a cold 46 deg F in Long Beach at 4:30 due to the very dry air we are currently experiencing. Having warmer mornings and winter temperatures will obviously be a net benefit to most plants and animals and should make it more pleasant for humans as well.